The structure of two orthorhombic nitroprussides:Cd[Fe(CN)5NO]·2H2O and Zn[Fe(CN)5NO]·2H2O
When zinc and cadmium nitroprussides, obtained as powders or single-crystals samples, are aged in air they lose crystallization water and change their crystalline structure. In the stable form these two complexes are orthorhombic dihydrates with four molecules in the unit cell. In the aging process...
| Autores: | , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2000 |
| País: | México |
| Recursos: | Instituto Politécnico Nacional |
| Repositorio: | Repositorio Digital del IPN |
| OAI Identifier: | oai:www.repositoriodigital.ipn.mx:123456789/11697 |
| Acesso em linha: | http://hdl.handle.net/123456789/1237 http://www.repositoriodigital.ipn.mx/handle/123456789/11697 |
| Access Level: | acceso abierto |
| Palavra-chave: | Nitroprusside Rietveld method Crystal structure Powder diffraction Mo¨ssbauer spectra Pentacyanide |
| Resumo: | When zinc and cadmium nitroprussides, obtained as powders or single-crystals samples, are aged in air they lose crystallization water and change their crystalline structure. In the stable form these two complexes are orthorhombic dihydrates with four molecules in the unit cell. In the aging process the crystals become brittle producing a polycrystalline material. The crystalline structure of these two complexes (orthorhombic dihydrates) was refined from their XRD powder patterns using the Rietveld method. As the starting model in the refining process the reported orthorhombic structure of copper nitroprusside (dihydrate) was used. The main changes in the dehydration process associated with the structural transformation take place in the coordination sphere of the outer cation (Cd or Zn). © 2001 Elsevier Science B.V. All rights reserved. |
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